password_verify

(PHP 5 >= 5.5.0, PHP 7)

password_verify — Verifies that a password matches a hash

Description

boolpassword_verify
( string$password
, string$hash
)

Verifies that the given hash matches the given password.

Note that password_hash() returns the algorithm, cost and salt
as part of the returned hash. Therefore, all information that's needed to verify
the hash is included in it. This allows the verify function to verify the hash
without needing separate storage for the salt or algorithm information.

See Also

User Contributed Notes 6 notes

If you get incorrect false responses from password_verify when manually including the hash variable (eg. for testing) and you know it should be correct, make sure you are enclosing the hash variable in single quotes (') and not double quotes (").

PHP parses anything that starts with a $ inside double quotes as a variable:

<?php
// this will result in 'Invalid Password' as the hash is parsed into 3 variables of
// $2y, $07 and $BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq
// due to it being enclosed inside double quotes
$hash = "$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq";

// this will result in 'Password is valid' as variables are not parsed inside single quotes
$hash = '$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq';

The function password_verify() uses constant time. This makes it safe against timing attacks. Don't use crypt($password_database) === crypt($password_given_by_login), since there is no protection against timing attacks!

If you don't want to use password_verify(), then have a look at hash_equals(), which also runs a timing attack safe string comparison.

This Is The Most Secure Way To Keep Your Password Safe With PHP 7 , Even When Your DataBase Has Been Hacked ,It Will Be Almost Impossible To Retrieve Your Password .----------------------------------------------------------- When A User Wants To Sign Up ---1 ---> Get Input From User Which Is The User`s Password1 ---> Hash The Password2 ---> Store The Hashed Password In Your DataBase--------------------------------------------------------<?php$hashed_password = password_hash($_POST["password"],PASSWORD_DEFAULT);

// $_POST["password"] ---> Is The User`s Input// $hashed_password ---> Is The Hashed Password You Can Store In Your DataBase?>----------------------------------------------------------- When A User Wants To Sign In ---1 ---> Get Input From User Which Is The User`s Password2 ---> Fetch The Hashed Password From Your Database3 ---> Compare The User`s Input And The Hashed Password --------------------------------------------------------<?phpif(password_verify($_POST["password"],$hashed_password)) echo "Welcome";

else echo "Wrong Password";

// $_POST["password"] ---> Is The User`s Input// $hashed_password ---> Is The Hashed Password You Have Fetched From DataBase?>